fstrsel sm06 toolchng mcode 6 -1 Buffers allow your post to "remember" previous outputs. Example: Only output G28 on the first tool change, but not again until a new work offset is called.
Locate the scoolant string definitions.
Edit:
A post processor is a translator. It takes the generic NCI (Numerical Control Interface) file from Mastercam and converts it into a specific dialect of G-code (Fanuc, Haas, Siemens, Heidenhain, etc.). Out of the box, Mastercam includes hundreds of generic posts, but generic rarely means perfect.
ptlchg$ #Tool change pbld, n$, "T", t$, "M06", e$ pbld, n$, "S", spindlspd, "M03", e$ Add the line: